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Chrome removal from phosphoric acid

I'm looking for any practical method for removal of chrome, aluminum, and other metals from phosphoric acid (1500-gal tank, 70-75%/wt); chrome is now at 180 ppm - I need to go down as much as possible and be able to repeat that process quite frequently.

Thanks for help.

Chris Onzol
- Canoga Park, California

We have removed the metals and organics from our 7 plating lines for the past 1.5 years plus. Read the March issue of the Strategic Goals Plan Update at strategicgoals.org to see how.

David C. French
- Charlotte, NC, US

It is possible and practical to remove cationic metals from phosphoric acid using ion exchange. However, I have never tried this on a solution as concentrated as 75% by weight acid.

Lyle Kirman
consultant - Cleveland Heights, Ohio

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